Guo Xiaoxue, Wu Fang, Hao Gazi, Peng Shisi, Wang Ning, Li Qiulin, Hu Yubing, Jiang Wei
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
Dalton Trans. 2019 Apr 16;48(16):5214-5221. doi: 10.1039/c9dt00538b.
It is highly desirable to design and develop low-cost and Earth-abundant non-noble-metal electrocatalysts for the efficient and durable oxygen evolution reaction (OER) under alkaline conditions. Herein, hierarchically porous hortensia-like CoAl hydroxysulfide is converted from CoAl layered double hydroxides via alkaline etching and sulfuration strategies as an efficient electrocatalyst for the OER. In 1 M KOH, this electrode requires a low overpotential of 270 mV to drive the current density of 10 mA cm-2, with a small Tafel slope of 63 mV dec-1. Furthermore, it also possesses remarkably high stability with its activity being maintained at a stable overpotential of 10 mA cm-2 after testing for 26 h. Our work provides a promising cost-effective OER catalyst for large-scale electrochemical applications.
设计和开发低成本且地球上储量丰富的非贵金属电催化剂，以在碱性条件下高效且持久地进行析氧反应（OER）是非常必要的。在此，通过碱性蚀刻和硫化策略将分层多孔的绣球花状羟基硫化钴铝从钴铝层状双氢氧化物转化为一种用于OER的高效电催化剂。在1 M KOH中，该电极驱动10 mA cm-2的电流密度时需要270 mV的低过电位，塔菲尔斜率为63 mV dec-1。此外，它还具有非常高的稳定性，在测试26小时后，其活性在10 mA cm-2的稳定过电位下得以保持。我们的工作为大规模电化学应用提供了一种有前景的具有成本效益的OER催化剂。
